Warp stop motion for looms



Dec. 29,1925- .J. NoRTHRoP WARP STOP MOTION FOR LOOMS Filed NOV. 16. 1923 MIZ/Z665 .Patented Dec. 29, 1925.

UNITED STATES PATENT OFFICE.

.IONAS NOBTHBOP, F HOPEDALE, MASSACHUSETTS, ASSIGNOB T0 HOPEDALE MAN U- i FACTUBING COMPANY. F MILFORD. MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

` WAR? STOP MOTION FOR LOQMS.

Application led November 1.6, 1923. Serial No. 675,122.

To all 'whom t may concern.'

vBe it known that I, JoNAs Noa'rHRoP, a citizen of f the United States, residing at Hopedale, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Warp Stop Motions for Looms: and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art towhich it appertaius to make and use the same.

The present invention relates to warp stop motions for looms.

The object ofthe invention is to provide a warp stop motion having provision for indicating the place of warp breakage, and tothis end the invention consists in the warp stop motion hereinafter described and particularly defined in the claims. l

In the accompanying drawings Fig. 1 is a side elevation, partly in section,of a wa stop motion embodying the features of the lpresent invention; Fig. 2 is a front elevation of the warp sto motion; and Fig. 3 is a plan view illustrating the operation of the indicating means. v

The illustrated embodiment of the invention comprises drop wires 6, each adapted to be supported by an individual warp thread, a frame 8 and a feeler bar 10. The feeler bar is connected through a lever 12 and link 14 to an oscillating part of the loom so that the detector is caused to oscillate below a pair of laterally extending angle irons 16 which form a part of the frame 8. On top of each angle iron 16 is secured a plate or stop bar 18 which extends over the edge of the angle iron 16 and is adapted to be engaged by a fallen drop wire when thelatter is struck by the detector.

Heretofore it has been customary'to engage the fallen drop wire between the feeler 10 and the angle iron 16. However, since the angle iron is situated immediately above and close to the path of oscillation of the feeler, the drop wire maintains its position parallel to the other drop wires and thus fails to give an indicationy of the place of warp breakage. In view of the large number of warps it takes time to locate the broken warp when this prior form of warp stop motion is used. According to the Sres ent invention, the. engagement of the rop wire between the feeler l0 and the plate 18 which is situated an appreciable distance above the feeler causes a slight turning or twisting of the drop wire around a vertical axis, thereby spreading the adjacent drop Wires slightly as indicated in Figs. 2 and 3. This gives a positive indication of the place of warp breakage which is readily noticeable by the weaver, thereby enabling him to repair the broken thread and start the loom 1n a minimum of time.

Although the action of the fallen drop wire when engaged by the feeler is not perfectly understood, it is believed to take place 1n the following manner t-If the drop Wire is engaged between points of approximately equal height, as by the feeler 10 and the angle bar 16 as in prior forms of warp stop motions, there is no tendency for distortion of any part of the drop wire. However, if the drop wire is engaged between points which are an ap reciable distance apart, as by the feeler an stop bar in the present invention, the drop wire, being of light construction, is caused to undergo a definite distortion at its lower portion between the feeler and stop bar. The drop wire is twisted about a vertical axis; the lower portion is turned by a considerable amount, while the upper portion being limited in movement by the supporting bar and the pressure of the adjacent drop wires, inclines at a less degree. This causes the edges of the lower portion of the drop wire to be angularly presented to the 1feeler and stop bar so that upon the continued pressure of the feeler the edges of the drop wire may slide over the engaging surfaces into an even more inclined position. This is in eiect a turning movement of the drop wire about its vertical axis.

While it is preferred to employ the speciic construction and arrangement of parte shown and described, it will be understood that this construction and arrangement is not essential except so far as specified in the claims and may be changed or modiied without departing from the broader fea.- tures of the invention.

The invention having been described, what is claimed is:

1. A warp stop motion for looms having, in combination, drop wires having slots at their up r ends, a drop wire bnr in the slots, a eeler 'adapted to engage with the lewe!n end of a elen drop wife, end steend of a ellen drop wire, and e stop bei* l@ tiomery means cooperating with -the eeer located above the feee for engaging the above the latter to tum the drop Wire to drop wire and arranged e su-eient distance spread the Warp on either side thereof to from the feeler yoer to impart e turning 5 indicate the place of Warp breakage. movement to the drop Wxe in e manner o 2. A warp stop motion for ooms having, spread adjeeen'l drop wires and indicate the l5 in combination, drop wires having slots et place of warp breekege. their upper ends, a drop wire bei: in the slots, e feeler ber epted to engage the lower JNALS NR'IHRP. 

